Commit | Line | Data |
---|---|---|
c63b3cba VK |
1 | /* |
2 | * drivers/mmc/host/sdhci-spear.c | |
3 | * | |
4 | * Support of SDHCI platform devices for spear soc family | |
5 | * | |
6 | * Copyright (C) 2010 ST Microelectronics | |
10d8935f | 7 | * Viresh Kumar <viresh.linux@gmail.com> |
c63b3cba VK |
8 | * |
9 | * Inspired by sdhci-pltfm.c | |
10 | * | |
11 | * This file is licensed under the terms of the GNU General Public | |
12 | * License version 2. This program is licensed "as is" without any | |
13 | * warranty of any kind, whether express or implied. | |
14 | */ | |
15 | ||
16 | #include <linux/clk.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/gpio.h> | |
19 | #include <linux/highmem.h> | |
88b47679 | 20 | #include <linux/module.h> |
c63b3cba VK |
21 | #include <linux/interrupt.h> |
22 | #include <linux/irq.h> | |
067bf748 VK |
23 | #include <linux/of.h> |
24 | #include <linux/of_gpio.h> | |
c63b3cba | 25 | #include <linux/platform_device.h> |
b70a7fab | 26 | #include <linux/pm.h> |
c63b3cba VK |
27 | #include <linux/slab.h> |
28 | #include <linux/mmc/host.h> | |
29 | #include <linux/mmc/sdhci-spear.h> | |
b42b9b12 | 30 | #include <linux/mmc/slot-gpio.h> |
c63b3cba VK |
31 | #include <linux/io.h> |
32 | #include "sdhci.h" | |
33 | ||
34 | struct spear_sdhci { | |
35 | struct clk *clk; | |
36 | struct sdhci_plat_data *data; | |
37 | }; | |
38 | ||
39 | /* sdhci ops */ | |
c915568d | 40 | static const struct sdhci_ops sdhci_pltfm_ops = { |
c63b3cba VK |
41 | /* Nothing to do for now. */ |
42 | }; | |
43 | ||
067bf748 | 44 | #ifdef CONFIG_OF |
c3be1efd | 45 | static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev) |
067bf748 VK |
46 | { |
47 | struct device_node *np = pdev->dev.of_node; | |
48 | struct sdhci_plat_data *pdata = NULL; | |
49 | int cd_gpio; | |
50 | ||
51 | cd_gpio = of_get_named_gpio(np, "cd-gpios", 0); | |
52 | if (!gpio_is_valid(cd_gpio)) | |
53 | cd_gpio = -1; | |
54 | ||
55 | /* If pdata is required */ | |
56 | if (cd_gpio != -1) { | |
57 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
eab36b24 | 58 | if (!pdata) |
067bf748 | 59 | dev_err(&pdev->dev, "DT: kzalloc failed\n"); |
eab36b24 SK |
60 | else |
61 | pdata->card_int_gpio = cd_gpio; | |
067bf748 VK |
62 | } |
63 | ||
067bf748 VK |
64 | return pdata; |
65 | } | |
66 | #else | |
c3be1efd | 67 | static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev) |
067bf748 VK |
68 | { |
69 | return ERR_PTR(-ENOSYS); | |
70 | } | |
71 | #endif | |
72 | ||
c3be1efd | 73 | static int sdhci_probe(struct platform_device *pdev) |
c63b3cba | 74 | { |
067bf748 | 75 | struct device_node *np = pdev->dev.of_node; |
c63b3cba VK |
76 | struct sdhci_host *host; |
77 | struct resource *iomem; | |
78 | struct spear_sdhci *sdhci; | |
fcdb7c8f | 79 | struct device *dev; |
c63b3cba VK |
80 | int ret; |
81 | ||
fcdb7c8f RK |
82 | dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev; |
83 | host = sdhci_alloc_host(dev, sizeof(*sdhci)); | |
84 | if (IS_ERR(host)) { | |
85 | ret = PTR_ERR(host); | |
c63b3cba | 86 | dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n"); |
6ebaf8f2 | 87 | goto err; |
c63b3cba VK |
88 | } |
89 | ||
475d9e3e RK |
90 | iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
91 | host->ioaddr = devm_ioremap_resource(&pdev->dev, iomem); | |
92 | if (IS_ERR(host->ioaddr)) { | |
93 | ret = PTR_ERR(host->ioaddr); | |
94 | dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret); | |
95 | goto err_host; | |
96 | } | |
97 | ||
98 | host->hw_name = "sdhci"; | |
99 | host->ops = &sdhci_pltfm_ops; | |
100 | host->irq = platform_get_irq(pdev, 0); | |
101 | host->quirks = SDHCI_QUIRK_BROKEN_ADMA; | |
102 | ||
fcdb7c8f RK |
103 | sdhci = sdhci_priv(host); |
104 | ||
c63b3cba | 105 | /* clk enable */ |
142dbab9 | 106 | sdhci->clk = devm_clk_get(&pdev->dev, NULL); |
c63b3cba VK |
107 | if (IS_ERR(sdhci->clk)) { |
108 | ret = PTR_ERR(sdhci->clk); | |
109 | dev_dbg(&pdev->dev, "Error getting clock\n"); | |
fcdb7c8f | 110 | goto err_host; |
c63b3cba VK |
111 | } |
112 | ||
da764f97 | 113 | ret = clk_prepare_enable(sdhci->clk); |
c63b3cba VK |
114 | if (ret) { |
115 | dev_dbg(&pdev->dev, "Error enabling clock\n"); | |
fcdb7c8f | 116 | goto err_host; |
c63b3cba VK |
117 | } |
118 | ||
257f9df1 VKS |
119 | ret = clk_set_rate(sdhci->clk, 50000000); |
120 | if (ret) | |
121 | dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n", | |
122 | clk_get_rate(sdhci->clk)); | |
123 | ||
067bf748 VK |
124 | if (np) { |
125 | sdhci->data = sdhci_probe_config_dt(pdev); | |
126 | if (IS_ERR(sdhci->data)) { | |
127 | dev_err(&pdev->dev, "DT: Failed to get pdata\n"); | |
142dbab9 | 128 | goto disable_clk; |
067bf748 VK |
129 | } |
130 | } else { | |
131 | sdhci->data = dev_get_platdata(&pdev->dev); | |
132 | } | |
133 | ||
b42b9b12 RK |
134 | /* |
135 | * It is optional to use GPIOs for sdhci card detection. If | |
136 | * sdhci->data is NULL, then use original sdhci lines otherwise | |
137 | * GPIO lines. We use the built-in GPIO support for this. | |
138 | */ | |
139 | if (sdhci->data && sdhci->data->card_int_gpio >= 0) { | |
140 | ret = mmc_gpio_request_cd(host->mmc, | |
141 | sdhci->data->card_int_gpio, 0); | |
142 | if (ret < 0) { | |
143 | dev_dbg(&pdev->dev, | |
144 | "failed to request card-detect gpio%d\n", | |
145 | sdhci->data->card_int_gpio); | |
146 | goto disable_clk; | |
147 | } | |
148 | } | |
149 | ||
c63b3cba VK |
150 | ret = sdhci_add_host(host); |
151 | if (ret) { | |
152 | dev_dbg(&pdev->dev, "error adding host\n"); | |
fcdb7c8f | 153 | goto disable_clk; |
c63b3cba VK |
154 | } |
155 | ||
156 | platform_set_drvdata(pdev, host); | |
157 | ||
c63b3cba VK |
158 | return 0; |
159 | ||
6ebaf8f2 | 160 | disable_clk: |
da764f97 | 161 | clk_disable_unprepare(sdhci->clk); |
fcdb7c8f RK |
162 | err_host: |
163 | sdhci_free_host(host); | |
c63b3cba VK |
164 | err: |
165 | dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret); | |
166 | return ret; | |
167 | } | |
168 | ||
6e0ee714 | 169 | static int sdhci_remove(struct platform_device *pdev) |
c63b3cba VK |
170 | { |
171 | struct sdhci_host *host = platform_get_drvdata(pdev); | |
fcdb7c8f | 172 | struct spear_sdhci *sdhci = sdhci_priv(host); |
6ebaf8f2 | 173 | int dead = 0; |
c63b3cba VK |
174 | u32 scratch; |
175 | ||
c63b3cba VK |
176 | scratch = readl(host->ioaddr + SDHCI_INT_STATUS); |
177 | if (scratch == (u32)-1) | |
178 | dead = 1; | |
179 | ||
180 | sdhci_remove_host(host, dead); | |
da764f97 | 181 | clk_disable_unprepare(sdhci->clk); |
fcdb7c8f | 182 | sdhci_free_host(host); |
c63b3cba VK |
183 | |
184 | return 0; | |
185 | } | |
186 | ||
b0dd099c | 187 | #ifdef CONFIG_PM_SLEEP |
b70a7fab VK |
188 | static int sdhci_suspend(struct device *dev) |
189 | { | |
190 | struct sdhci_host *host = dev_get_drvdata(dev); | |
fcdb7c8f | 191 | struct spear_sdhci *sdhci = sdhci_priv(host); |
b70a7fab VK |
192 | int ret; |
193 | ||
984589e5 | 194 | ret = sdhci_suspend_host(host); |
b70a7fab | 195 | if (!ret) |
06960a1b | 196 | clk_disable(sdhci->clk); |
b70a7fab VK |
197 | |
198 | return ret; | |
199 | } | |
200 | ||
201 | static int sdhci_resume(struct device *dev) | |
202 | { | |
203 | struct sdhci_host *host = dev_get_drvdata(dev); | |
fcdb7c8f | 204 | struct spear_sdhci *sdhci = sdhci_priv(host); |
b70a7fab VK |
205 | int ret; |
206 | ||
06960a1b | 207 | ret = clk_enable(sdhci->clk); |
b70a7fab VK |
208 | if (ret) { |
209 | dev_dbg(dev, "Resume: Error enabling clock\n"); | |
210 | return ret; | |
211 | } | |
212 | ||
213 | return sdhci_resume_host(host); | |
214 | } | |
b70a7fab VK |
215 | #endif |
216 | ||
4b1a6170 SH |
217 | static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume); |
218 | ||
067bf748 VK |
219 | #ifdef CONFIG_OF |
220 | static const struct of_device_id sdhci_spear_id_table[] = { | |
221 | { .compatible = "st,spear300-sdhci" }, | |
222 | {} | |
223 | }; | |
224 | MODULE_DEVICE_TABLE(of, sdhci_spear_id_table); | |
225 | #endif | |
226 | ||
c63b3cba VK |
227 | static struct platform_driver sdhci_driver = { |
228 | .driver = { | |
229 | .name = "sdhci", | |
230 | .owner = THIS_MODULE, | |
b70a7fab | 231 | .pm = &sdhci_pm_ops, |
067bf748 | 232 | .of_match_table = of_match_ptr(sdhci_spear_id_table), |
c63b3cba VK |
233 | }, |
234 | .probe = sdhci_probe, | |
0433c143 | 235 | .remove = sdhci_remove, |
c63b3cba VK |
236 | }; |
237 | ||
d1f81a64 | 238 | module_platform_driver(sdhci_driver); |
c63b3cba VK |
239 | |
240 | MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver"); | |
10d8935f | 241 | MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>"); |
c63b3cba | 242 | MODULE_LICENSE("GPL v2"); |